<template>
  <div class="list" ref="wrapper">
    <div>
      <div class="area">
        <div class="title border-topbottom">当前城市</div>
        <div class="btn-list">
          <div class="btn-wrapper">
            <div class="btn">{{currentCity}}</div>
          </div>
        </div>
      </div>
      <div class="area">
        <div class="title border-topbottom">热门城市</div>
        <div class="btn-list">
          <div
            class="btn-wrapper"
            v-for="item of hot"
            :key="item.id"
            @click="handleCityClick(item.name)"
          >
            <div class="btn">{{item.name}}</div>
          </div>
        </div>
      </div>
      <div
        class="area"
        v-for="(item, key) of cities"
        :key="key"
        :ref="key"
      >
        <div class="title border-topbottom">{{key}}</div>
        <div class="item-list">
          <div
          class="item border-bottom"
          v-for="innerItem of item"
          :key="innerItem.id"
          @click="handleCityClick(innerItem.name)"
        >
          {{innerItem.name}}
        </div>
        </div>
      </div>
    </div>
  </div>
</template>
<script>
import Bscroll from 'better-scroll'
// 使用vuex提供的mapState进行数据扩展获取
import { mapState } from 'vuex'
export default {
  name: 'CityList',
  props: {
    hot: Array,
    cities: Object,
    letter: String
  },
  mounted () {
    this.scroll = new Bscroll(this.$refs.wrapper)
  },
  watch: {
    letter () {
      if (this.letter) {
        const element = this.$refs[this.letter][0]
        this.scroll.scrollToElement(element)
      }
    }
  },
  computed: {
    ...mapState({
      currentCity: 'city'
    })
  },
  methods: {
    handleCityClick (city) {
      this.$store.dispatch('changeCity', city)
      this.$router.go(-1)
    }
  }
}
</script>
<style lang="stylus" scoped>
  @import '~styles/varibles.styl'
  .border-topbottom
    &:before
      border-color: #ccc
    &:after
      border-color: #ccc
  .border-bottom
    &:before
      border-color: #ccc
  .list
    overflow hidden
    position absolute
    top 1.58rem
    left 0
    right 0
    bottom 0
  .title
    line-height: .54rem
    background-color: #eee
    padding-left: .2rem
    color: #666
    font-size: .26rem
  .btn-list
    padding .1rem .6rem .1rem .1rem
    overflow hidden
    display flex
    flex-wrap wrap
    .btn-wrapper
      width 33%
      .btn
        margin .1rem
        padding .1rem 0
        text-align center
        border .02rem solid #ccc
        border-radius 0.06rem
  .item-list
    .item
      line-height .76rem
      color #666666
      padding-left .2rem
</style>
